This white paper describes the protocols
which are typically involved when transporting voice over an IP based network. A
basic understanding of the protocols is required in order to understand the bandwidth
overhead of voice over IP and the Quality of Service issues surrounding the technology.

There are many factors involved when calculating the bandwidth required through a
network. This white paper aims to
explain these factors, and to offer a simple means of making such calculations. It
starts with a basic 'rule of thumb', and then expands this to take specific voice coding
algorithms into account.

This white paper describes the steps
involved in assessing the staffing requirements of a call centre and estimating the number
of trunks (central office lines) required to serve a call centre for incoming calls.